Benjamin p



(No Model.)

B. F. MITCHELL.

HOLLOW PUNCH.

No. 300,624. PatentedJune 1'7, 1884.

WITNESSES "INVENTOR flwvaa/ fl 'n 777mb v w/Mia;

ATTORNEYS 'UNr'rEE S'rArEs ArE-Nr Erica.

BENJAMIN F. MrroHELL, OF MIDDLETOWN, CONNECTICUT, assrenon TO WILOOX,ORITTENDEN & 00., OF SAME rLAoE.

HOLLOW PUNCH.

SPECIFICATION forming part of Letters Patent No. 300,624, dated June 17,1884.

Application filed November 30, 1883. No model.)

T at whom it may concern Be it known that I, BENJAMIN F. MIrcHELL, acitizen of the United States, residing at Middletown, in the county ofMiddlesex and State of Connecticut, have invented new and usefulImprovements in Hollow Punches, of which the following is aspecification.

This invention has for its object to provide a novel and eflicienthollow punch; and it consists in the construction and combination ofdevices hereinafter described and claimed, reference being had to theaccompanying draw- I ings, illustrating my invention, in which Figure 1represents a face view. Fig. 2 is a side view. Fig. 3 is a section inthe plane ;v as, Fig. 2. Fig. 4 is a side view of the handle. Fig. 5 isa section of the cutter.

Similar letters indicate corresponding parts.

In the drawings, the letter A designates the handle of my punch, and Bis the cutter. The handle is made of malleable iron, wroughtiron, steel,or any other material suitable for the purpose, and it is provided atits bottom end with a tubular projection, a, the bore of whichcommunicates with a channel, 1), extending transversely through the bodyof the handle. The cutter B is hollow, as shown in Fig. 3, and it isprovided at its butt-end with a socket, c, to receive the tubularprojection. If desired, the butt-end of the cutter may be turned off tofit the interior of the tubular projection a, and I do not wish toconfine my-.

self to the exact relation of these parts as the same are represented inthe drawings. The cutter and the handle are detachably connectedtogether by the frictional contact between the parts; but, if desired, aset-screw may be employed torigidly but detachably connect these parts,as will be obvious without further illustration, the set-screw simplypassing through the butt-end of the cutter to bind against the tubularprojection of the handle when these parts are arranged as shown. Thebore of the tubular projection a corresponds to the bore of the largestcutter which is to be fitted to the handle; but my handle can be usedwith different sizes of cutters, and

in practice I intend to fit three sizes of cutters to one and the samehandle. In using the cutter which may be attached to the handle,

the wads freely discharge through the bore of the tubular projection andthrough the channel b.

At the inner end of the socket c, in the butt-end of the cutter B, isformed a shoul- 5 5 der, (2, which abuts against the outer end of thetubular projection a, so as to prevent the cutter from being driveninward by the blows of the hammer or mallet to which the handle isexposed when the punch is used.

At the inner end of the tubular projection a is formed a shoulder, 0,against which abuts the butt-end of the cutter B. The effect of thisshoulder is practically the same as that of the shoulder (Z, and by thecombined action of both shoulders the cutter is prevented without failfrom being driven inward by the blows of the hammer, and at the sametime a good finish is given to the punch when the cutter and the handleare united, as shown in the drawings.

By my invention much time and expense are saved in the manufacture ofthe punches.

In my punches the handles can be made of malleable iron, if desired, andone and the same handle can be used for several sizes of cutters, whileif the handle and the cutter are made solid out of one and the samepiece of metal the handle, as well as the cutter must be made of steel,and since each cutter has its own handle a large quantity of steel isrequired for a series of punches, and the labor required inmanufacturing said punches is much larger than that required formanufacturing the same number and sizes of punches 8 5 according to myinvention.

My invention is not confined to hollow cutters with a circular opening;but it is applicable to hollow cutters of any desired shape.

\Vhat I claim as new, and desire to secure by Letters Patent, is-

A hollow punch consisting of the handle A, having the transverse channel12, the smooth tubular projection a, and the lateral shoulder e at thebase of the projection and below the 5 transverse channel, and thehollow cutter B,

having one end formed into a cutting-edge, In testimony\vhereofIlnweherennto set my and constructed with the lateral interiorshonlhand and seal in the presence of two subscribder', (1, and smoothsocket 0, said cutter being ing witnesses.

detachably applied to the tubular projection, BENJAMIN F. MITCHELL. [1.5.] 5 and the bore of the latter equal to or greater \Vitnesses:

than the bore of the cutter, substantially as and CARRIE T. E. SILL,

for the purposes described. ,1 J AMES READ.

